Angle

Angle

Angle

The separation of between two straight lines joining at a point is called an angle. When two line segments have a single common point, then an angle is formed at that point.
Angle ∠ABC
In the given figure, two line segments AB and BC have a single common point B, then angle ABC is formed at B. It is represented by the symbol ‘’ while writing. The angle can be writen as ABC or CBA.

Types of Angles

According to the measure of an angle, there are different types of angles as follows:

Right angle

An angle whose measure is exactly 90° is called a right angle. 
Right angle
In the given figure, ABC is 90°. So ABC is marked as a Right Angle by a small square at B.

Acute Angle

An angle which is less than 90° and more than 0° is called an acute angle. 
Acute Angle
In the given figure, QPS = 60° which is less than 90°. So QPS is an acute angle.

Obtuse Angle

An angle which is less than 180° and more than 90° is called an obtuse angle. 
Obtuse Angle
All angles between 90° to 180° are called obtuse angles. In the given figure AOB is more than 90° but less than 180°. i.e. AOB = 135°. So, AOB is an obtuse angle.

Straight Angle

An angle of exactly 180° is called a straight angle. 
Straight Angle
In the given figure, ABC = 180°. So ABC is a straight angle.

Reflex Angle

The angle which is less than 360° and more than 180° is called a reflex angle. 
Reflex Angle
In the given figure, XYZ = 220°, which is less than 360° and more than 180°. So XYZ is an reflex angle.

Full Turn Angle

The angle which is equal to 360° is called a full turn angle (complete angle). 
Full Turn Angle
In the given figure, ABC = 360°. So, ABC is a full turn angle.

No comments:

Powered by Blogger.